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Recognised as Colour

#1B3965

  • #1B3965
  • Blue
  • Dark
  • Nearest: Dark slateblue

#1B3965 is a blue with RGB values 27, 57, 101 and HSL 216°, 58%, 25%. It is a dark colour, so white text on it reaches 11.5:1 contrast (AAA for normal text). The nearest named colour is Dark slateblue.

Colour values

#1B3965#1B3965
HEX#1B3965
RGBrgb(27, 57, 101)
RGB (0–1)0.1059, 0.2235, 0.3961
RGB percentages10.6%, 22.4%, 39.6%
HSLhsl(215.7, 57.8%, 25.1%)
HSV / HSBhsv(215.7, 73.3%, 39.6%)
CMYK73.3%, 43.6%, 0%, 60.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,784,165
CSS custom property--colour: #1B3965;

Brightness & contrast

Relative luminance0.04099WCAG 2.x, 0 is black and 1 is white
Perceived brightness57.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.54:1
Contrast with white11.54:1WCAG normal text: AAA
Contrast with black1.82:1WCAG normal text: Fail
Greyscale equivalent#363636
Inverted#E4C69A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#253D67no red cones; affects about 1% of men; ΔE 2.6 from the original
Deuteranopia#193664no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#00434Ano blue cones; rare, and affects men and women equally; ΔE 28.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.54:1WCAG large text: AAA
Contrast with black, large text1.82:1WCAG large text: Fail

Named colours

Dark slateblue · ΔE 25.4Steel blue · ΔE 30.1Dark slate grey · ΔE 31.5Midnight blue · ΔE 34.4Slate grey · ΔE 35.1Dim grey · ΔE 36
Nearest named CSS colourDark slateblue (#483D8B)ΔE 25.39, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#65471B
Analogous#1B5E65, #221B65
Triadic#651B39, #39651B
Split complementary#65221B, #5E651B
Tetradic#651B5E, #65471B, #1B6522

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#739CD9
Lighter +30%#4A80CF
Lighter +20%#3166B5
Lighter +10%#26508D
Darker −10%#10223D
Darker −20%#050C15
Darker −30%#000000
Darker −40%#000000
More saturated +25%#0B3675
Less saturated −25%#2B3C55

Channel breakdown

R27
G57
B101
Red27 (10.6%)
Green57 (22.4%)
Blue101 (39.6%)
Hue215.68°
Saturation (HSL)57.81%
Lightness25.1%
Dominant channelBlue
Hex per channelR 1B · G 39 · B 65

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Every value on this page was computed from “1b3965” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.